Optical scanning device

Details Optical scanning device Optical scanning device

2006-10-31

2006-10-31

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S719000, C369S112240

Reexamination Certificate

active

07130134

ABSTRACT:
The invention relates to an optical scanning device (1) for scanning an information layer (2) by means of a radiation beam (4). The device includes: a radiation source (6) for providing said radiation beam, a lens system (7) for transforming said radiation beam to a converging beam (16), and a wavefront modifier including a first element (301) and a second element (302) having each an aspheric surface and being mutually movable in a plane perpendicular to an optical axis (12) of said lens system for introducing a wavefront modification (W1) in said converging beam. According to the invention, the aspheric surfaces of said first and second elements are shaped so that a mutual rotational displacement of the elements about an axis of rotation (ZA) which is parallel to said optical axis (12) generates said wavefront modification (W1).

REFERENCES:
patent: 2005/0068879 (2005-03-01), Tukker et al.

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